CUMACEA FEOM THE COPENHAGEN MUSEUxM. 37 



The uropods have the peduncle a little longer than the last somite and about 3i 

 times as long as thick, with one or two minute setse on its inner edge. The endopod 

 is about 1^ times as long as the peduncle, somewhat indistinctly divided into two 

 subequal segments, with about 12 spines on its inner edge and two unequal terminal 

 spines. The exopod is longer than the endopod, with a slender terminal spine and a 

 series of setjB on its inner edge. 



Description of adult Male. — Total length 2-4 mm. 



Teeth of dorsal crest of carapace in some specimens only a little less marked than 

 in the female, in others almost obsolete. Pseudorostrum horizontal, truncated, about 

 one-sixth of total length of carapace. No antennal notch or tooth, the antero-lateral 

 corner rounded off, with a few obscure serrations. Only two oblique ridges on the 

 side of the carapace, corresponding to the two posterior ridges of the female. 



The antennules have the second and third segments of the peduncle shorter than in 

 the female, and together shorter than the first segment. The flagella are similar to 

 those of the female. 



The antennae have the penultimate segment of the peduncle more than one-half as 

 long as the succeeding segment. The flagellum is very short, not more than twice as 

 long as the peduncle, and not extending back beyond the first free thoracic somite in 

 the natural position. 



Exopods are present on all except the last pair of legs. 



Only the first abdominal segment has appendages and these are of very small size. 

 The peduncle is twice as long as broad and bears two minute unjointed rami. Each 

 ramus has a single long plumose seta, and the outer bears in addition one or two short 

 simple setae. 



The uropods hardly difi"er from those of the female, having only a few additional 

 small setae on the inner edge of the peduncle. 



Occurrence. — "Lyttleton Harbour, 5/97, 1-5 fathoms, H. Suter"; "Akaroa 

 Harbour, 8/97, 6 fathoms, H. Suter." Copenhagen Museum. Co-types in British 

 Museum. 



Hemileucon, gen. nov. 



Differing from Leucon and Paraleucon in having no pleopods in the male sex. 

 Type species H. unij)licatus, sp. n. 



Hemileucon uniplicatus, sp. n. (Plate IX. figs. 21-25.) 



I)escrii)tion of adult Female. — Total length 2-G mm. 



Carapace about one-fourth of total length, its vertical height a little more than two- 

 thirds of the length. The dorsal crest is sliglitly arched, its anterior half serrate. 

 Pseudorostrum straight, slightly upturned, obliquely truncate ; the length of its 



